fanart.tv agent not fetching season posters

It seems that fanart.tv agent in the latest Plex server does not fetch season posters. Is this the normal behavior?

The Info.xml for fanart.tv agent shows that series posters and backgrounds were fetched correctly.

<?xml version='1.0' encoding='utf-8'?>
<TV_Show id="75299">
  <rating/>
  <title_sort/>
  <art>
    <item external="True" url="http://assets.fanart.tv/fanart/tv/75299/showbackground/the-sopranos-52f383fc2f8bf.jpg" preview="76aa8ff95b7471a89f65216580e2b3a8b3db9ca1" sort_order="1"/>
    <item external="True" url="http://assets.fanart.tv/fanart/tv/75299/showbackground/the-sopranos-4fcd7908580a1.jpg" preview="5bd96ed24752e13363905da2dd8fcca5ab89ee5c" sort_order="2"/>
    <item external="True" url="http://assets.fanart.tv/fanart/tv/75299/showbackground/the-sopranos-5410fd199ea6d.jpg" preview="5e832cb966d5f71e4f4d1fac6ecd54f26b1023a5" sort_order="3"/>
  </art>
  <themes/>
  <posters>
    <item external="True" url="http://assets.fanart.tv/fanart/tv/75299/tvposter/the-sopranos-5343c7cc0a525.jpg" preview="5bbb33ece4be1948108633c55d0cdf63caed9712" sort_order="1"/>
    <item external="True" url="http://assets.fanart.tv/fanart/tv/75299/tvposter/the-sopranos-54497673a3640.jpg" preview="ff5524136f43af327dc548c69852c25c9a1041d7" sort_order="2"/>
    <item external="True" url="http://assets.fanart.tv/fanart/tv/75299/tvposter/the-sopranos-5236796a1b736.jpg" preview="dba05660b9d76ff92b6233cd34d03426bc06cdf4" sort_order="3"/>
    <item external="True" url="http://assets.fanart.tv/fanart/tv/75299/tvposter/the-sopranos-523679859129a.jpg" preview="a4db428ca42b51b18e8e6426d429df038ce75819" sort_order="4"/>
    <item external="True" url="http://assets.fanart.tv/fanart/tv/75299/tvposter/the-sopranos-5236796a1a780.jpg" preview="ba0c7fdc03ef5abfb49b91ee2ed8be75e3a1e5ae" sort_order="5"/>
  </posters>
  <duration/>
  <genres/>
  <title/>
  <rating_count/>
  <collections/>
  <tags/>
  <audience_rating_image/>
  <rating_image/>
  <audience_rating/>
  <studio/>
  <seasons>
    <item external="True" extension="xml" key="1"/>
    <item external="True" extension="xml" key="3"/>
    <item external="True" extension="xml" key="2"/>
    <item external="True" extension="xml" key="5"/>
    <item external="True" extension="xml" key="4"/>
    <item external="True" extension="xml" key="6"/>
  </seasons>
  <originally_available_at/>
  <roles/>
  <countries/>
  <content_rating/>
  <original_title/>
  <summary/>
  <reviews/>
  <banners>
    <item external="True" url="http://assets.fanart.tv/fanart/tv/75299/tvbanner/the-sopranos-5624c762da1f4.jpg" preview="b4f38960ce1d9025ceb2e2a9ab5a4bac9835250b" sort_order="1"/>
    <item external="True" url="http://assets.fanart.tv/fanart/tv/75299/tvbanner/the-sopranos-541850e36a611.jpg" preview="3408bb5893a0cbd72bf1043a6c9cf33ddb593929" sort_order="2"/>
    <item external="True" url="http://assets.fanart.tv/fanart/tv/75299/tvbanner/the-sopranos-5624c70daeb2f.jpg" preview="3589a79ae92590e4773fbdff8be119d09dd472d5" sort_order="3"/>
    <item external="True" url="http://assets.fanart.tv/fanart/tv/75299/tvbanner/the-sopranos-5624c8009834e.jpg" preview="fb0485d9bfd9b5b076179bd52fcb00ea6905f669" sort_order="4"/>
    <item external="True" url="http://assets.fanart.tv/fanart/tv/75299/tvbanner/the-sopranos-54185299b2b3d.jpg" preview="775642687648b523003bd5deeab1f0eff65a00ff" sort_order="5"/>
  </banners>
</TV_Show>

However, if I go into the seasons' XML files, this is what's inside:

<?xml version='1.0' encoding='utf-8'?>
<Season>
  <index/>
  <art/>
  <thumb/>
  <show/>
  <title/>
  <art_url/>
  <episode_count/>
  <summary/>
  <episodes/>
  <key/>
  <posters/>
  <banners/>
  <rating_key/>
  <source_title/>
</Season>

Totally empty!?